David Westenberg

Wilmer Cutler Pickering Hale and Dorr LLP

$ $$$

Boston 02109 MA US

David A. Westenberg is a partner in the Corporate Practice Group and the Capital Markets Group. He joined the firm in 1983. Mr. Westenberg has focused on the software, Internet and information technology industries for more than twenty years, guiding numerous startup clients from formation through venture financing and on to successful acquisitions or IPOs.

As outside corporate counsel to many public and private companies, Mr. Westenberg advises clients on a wide variety of corporate, securities, disclosure and governance matters. His transactional experience includes more than 50 IPOs and other capital markets transactions, as well as a large number of venture capital financings and M&A transactions.

He is the author of Initial Public Offerings: A Practical Guide to Going Public (Practising Law Institute), a comprehensive yet practical guide to the IPO process that has been hailed for its unprecedented breadth, depth and ease of use and was dubbed the “bible of the IPO market” by The New York Times (The Deal Professor, January 19, 2010).

Mr. Westenberg is active in various technology councils and is a former co-chair of the Corporate Law Committee of the Boston Bar Association. Mr. Westenberg writes frequently on the IPO and venture capital markets, and has been quoted or featured in The American Lawyer, Boston Business Journal, The Boston Globe, Boston Magazine.

Experience :

  • Acacia Communications’ $119 million IPO and $517 million follow-on public offering
  • Endurance International Group’s IPO raising $252 million and follow-on public offerings raising a total of $479 million
  • SS&C Technologies Holdings’ IPO and follow-on public offerings raising an aggregate of more than $1.4 billion
  • Bottomline Technologies’ follow-on public offerings of common stock and convertible senior notes raising a total of more than $250 million
  • “Dual track” IPO/sale for McLeodUSA, resulting in $557 million acquisition by PAETEC Holding
  • Prodigy’s IPO (then the largest Internet company IPO in history) and its $1.6 billion strategic transaction with SBC Communications.


  • JD, Harvard Law School, 1983
  • SB, Massachusetts Institute of Technology, 1979

ADMISSIONS : Massachusetts


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Boston 02109 MA US
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